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2390 S.Lipan St. <br /> Denver,CO 80223 <br /> K& (303)742-9700 <br /> Kumar & Associates, Inc. Fax 742-9666 <br /> Geotechnical&Environmental Engineers Branch Office—Colorado Springs,CO <br /> June 5, 1996 <br /> Douglas C. Seely, P.E. <br /> W.W. Wheeler & Associates, Inc. <br /> 3700 South Inca Street <br /> Englewood, CO 80110 <br /> Subject: Observation of Bypass Conduit Removal Excavation, <br /> Eagle Park Reservoir Outlet Works Construction, <br /> Cyprus Climax Metals, <br /> Eagle County, Colorado <br /> Project No. 95-435 <br /> Dear Mr. Seely: <br /> At your request, the undersigned visited the subject project site on June 4, 1996, to observe <br /> an excavation made to remove the existing bypass conduit from beneath the north flank of the <br />• breach excavation for the outlet conduit. We previously conducted a geotechnical engineering <br /> study for the project reported under our Project No. 92-220.1 A, dated December 13, 1993. <br /> Moisture-density (ASTM D 698) and classification laboratory testing was subsequently <br /> performed under our Project No. 95-435. <br />• <br /> Thee bypass conduit is a 24-inch diameter corrugated metal pipe (CMP), which will be <br /> abandoned as part of the ongoing construction. The original plan was to grout the entire <br /> bypass conduit in place from the point where it exited the breach excavation. However, <br /> inspections during construction revealed that a 45° bend in the pipe, approximately 70 to 80 <br /> feet back from the point where the pipe daylighted the excavation, had trapped debris. The <br /> contractor, ASI RCC, proposed to remove the debris from the conduit by excavating and <br /> removing the pipe back to the bend. We understand that the contractor asked you if the <br /> temporary excavation slopes for the bypass conduit removal could be steeper than the 1.5 <br /> (horizontal) to 1 (vertical) maximum slope originally recommended. <br />• <br />